<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<script src="js/Tools.js"></script>
	<script>
		window.onload=()=>{
			my$("div1").style.background = "red";
		}
		
	</script>
	<body>
		<div id="div1" >
			666
		</div>
	</body>
</html>